Ps3 Blue Ray Laser - Why Do They Die? - How Are They Fixed?, Who is rufurbing them and how? Options

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I run a repair and mod shop and I have been getting a few calls a week about people with PS3's that wont read disks.
So I located a supplier in China and got a few lasers w/ deck and found out they are not new but they are refurbished. Upon doing some more research it would seem new replacement blue ray lasers are very hard to come by perhaps not even possible to find. (or if you do find them new the supplier is lying and they are refurb)

So I have a couple of questions.

Does anyone know where to get NEW blue ray lasers for PS3 ?

The ones I have replaced for people so far have stopped playing CD's, DVD's and Blue ray all at once. The laser assembly has many parts on it. Has anyone narrowed down specifically what is causing them to fail ?

If there is people refurbishing these then I would sure love to know how they do it? Anyone got a clue?